Have 'em
I have both, shoot both, carry both, like both. Never had a problem with either.
Bersa, in my opinion, is a much better gun - albeit larger and heavier. If I had to keep only one of these two, it would be the Bersa. For IWB/OWB carry this is the better of the two for me.
BUT, the KelTec (P3AT) is, again in my opinion, one of the better pocket carry guns, and likely the best for the money (i.e. Kahr, etc. may be be "better", but at a much higher price). My P3AT has never had an FTF, FTE, or malfunction. I plan to buy a KelTec PF9 soon.
Have 'em both, gonna keep both of 'em. Pick one or both, you'll be OK.